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# Python | Numpy np.cheb2poly() method

• Last Updated : 03 Nov, 2019

With the help of `np.cheb2poly()` method, we can get the polynomial from chebyshev series by using `np.cheb2poly()` method.

Syntax : `np.cheb2poly(array)`
Return : Return array having coefficients of polynomial.

Example #1 :
In this example we can see that by using `np.cheb2poly()` method, we are able to get the polynomial from chebyshev series by using this method.

 `# import numpy``import` `numpy as np``from` `numpy ``import` `polynomial as P`` ` `x ``=` `np.array([``2``, ``5``, ``7``])`` ` `# using np.cheb2poly() method``gfg ``=` `P.Chebyshev(x)``gfg ``=` `gfg.convert(kind ``=` `P.Polynomial)``gfg ``=` `P.chebyshev.cheb2poly(gfg)`` ` `print``(gfg)`

[Polynomial([-5., 5., 14.], domain=[-1., 1.], window=[-1., 1.])]

Example #2 :

 `# import numpy``import` `numpy as np``from` `numpy ``import` `polynomial as P`` ` `x ``=` `np.array([``2``, ``3``, ``5``, ``7``, ``11``])`` ` `# using np.cheb2poly() method``gfg ``=` `P.Chebyshev(x)``gfg ``=` `gfg.convert(kind ``=` `P.Polynomial)``gfg ``=` `P.chebyshev.cheb2poly(gfg)`` ` `print``(gfg)`

[Polynomial([8., -18., -78., 28., 88.], domain=[-1., 1.], window=[-1., 1.])]

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